database,database-design , ER diagram for booking database


ER diagram for booking database

Question:

Tag: database,database-design

I'm creating a database for booking apartments app. I have a question - it is allowable to keep user's passwords in DB (for example using BCrytp)? Another question - where is the best way to keep price if it may vary during several months? ER diagram


Answer:

typically, you would store the password as some sort of encrypted hash. It is best if this is one-way, so it cannot be decrypted. When authenticating, you check that you can generate the same hash from the provided password; not decypt what is stored. Your hash should also be "salted" with some other data so two users with the same password don't have the same hash (so, using the username itself is popular).

If your prices vary, you'll want a separate table for prices that have date from and date to fields so you know the period of time the price is valid. Unless, you are saying that each "booking" can have a price - then you could just put the price in the booking table.


Related:


How do I access website databases? [closed]


database
I'm trying to better understand databases and networking. Basically my question is how do websites like these access player data from the game when they're not affiliated with the company? Do you have to have permission by the website to read their statistics? Are these databases private? What are different...

Pull information from SQL database and getting login errors


php,sql,database
I am creating a very small, simple CRM for a company, they require the function to be able to view the last 25 orders via the dashboard. The orders are added via a Order-add form within the CRM. When adding the following code to the CRM I get an error:...

Id in database using qt


database,qt,sqlite
I am new to qt. I have created a table in sql, and what I'm trying to do is to give an id whenever user adds data. For the first thing inserted it will be 1, second 2 and so on. So how to check what number was the last...

Creating a generic / abstract “DBContext” Class for shared functionality among different DBs


c#,database,generics,inheritance,abstract-class
I am working on a C# project that is pulling data from SQL Server, ODBC data-sources and Oracle Databases at different times. At this point, I have created 3 different classes - Once for each type of DB access. However, I am seeing that 95% of the code is identical...

creating stored procedure in mysql calculate profit from product table


mysql,sql,database,stored-procedures
My following code show some error: 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'BEGIN SET @v1:= (select sum( cost_price * current_stock) from product)' at line 2 CREATE PROCEDURE sp_profit BEGIN...

string split and subquery in mysql


php,mysql,database
first of all i have 1 table in database. 1)tags : id name 1 theme1=test1 2 theme1=test2 3 theme1=test3 4 theme2=test1 5 theme2=test2 6 theme2=test3 And i have bunch of id of tags in array. like 1,3. Now, 1)select name from tags where id=1 result: theme1=test1 (now using wildcard) 2)select...

How do I prevent MySQL Database Injection Attacks using vb.net?


mysql,.net,database,vb.net,sql-injection
I am using vb.net in Visual Basic 2010 and using Query to edit my Online MySQL Database from the application (WinForms). Here is a sample to insert a new user into the database: MySQLCon.Open() Dim SQLADD As String = "INSERT INTO members(member,gamertag,role) VALUES('" & memberToAdd.Text & "','" & membersGamertag.Text &...

Is there a way to create a primary key and have it cascade into other tables without re-entering data into the new tables?


mysql,database,cascade
I am working on setting up a database and have created tables that cascade out like using the cascade on update for the foreign key. I have two tables being worked with to try to solve this. My tables are like this: create table Item(Item int(4) not null, EquipName varchar(20),...

Why am getting this error?: Unknown column 'firstname' in 'field list'


php,database,mysqli
if(isset($_POST["submit"])) { // Details for inserting into the database $id = htmlentities($_POST["id"]); $firstname = htmlspecialchars($_POST["firstname"]); $lastname = htmlspecialchars($_POST["lastname"]); $username = htmlspecialchars($_POST["username"]); $password = htmlspecialchars($_POST["password"]); // Dealing with inserting $query = "INSERT INTO `myDatabaseForAll`.`users` (`id`, `firstname`, `lastname`, `username`, `password`) VALUES (NULL, $firstname, $lastname,$username,$password)"; $result = mysqli_query($connection,$query);...

Check if value exists in MySQL DB in Java?


java,mysql,database,jdbc
I'm creating a game right now that stores quest values into a DB when a player completes his or her quest. The issue I'm having right now is writing a method that searches the MySQL table for the player id and the quest id to check if he or she...

IBM Cognos _days_between function not working


mysql,database,date,cognos
I'm having an issue with Cognos 10. I'm trying to calculate the number of days between to dates so I use the _days_between( date1, date2 ) function. _days_between ([Derniere Date Changement diaphragme] , [Premiere Date Changement diaphragme]) I'm quite sure the two Dates are Date objects ( I set them...

What type of database is the best for storing array or object like data [on hold]


database,node.js,sockets
I'm just curious what the best method would be if I'm trying to have a bot running on my Node server that I could play Blackjack against. But for multiple connected clients via sockets, each connected socket will have their own bot to play against but I need some way...

Speeding up a SQL query with indexes


sql-server,database,performance
I have a table called Products. This table contains over 3 million entries. Every day there are approximately 5000 new entries. which only happens during the night in 2 minutes. But this table gets queried every night maybe over 20 000 times with this query. SELECT Price FROM Products WHERE...

SQL Server: checkident: “[S00014][2560] Parameter 3 is incorrect for this DBCC statement.”


sql-server,database
Using an SQL Server database. A lookup table is having 50 new items added to it using a database versioning tool so the same script will be run on all three databases. There is a Dev, QA, and Prod version of the database and because of political reasons prod can't...

sql script to find index's tablespace_name only


sql,database,oracle
Trying to find the specific tablespace names that were created for indexes only. I don't want to see the tablespaces names that are already used for tables. Something like below, but i couldn't have it working due to syntax error. Can someone fix it? select tablespace_name from dba_indexes where tablespace_name...

Pandas sql update efficiently


python,database,pandas
I am using python pandas to load data from a MySQL database, change, then update another table. There are a 100,000+ rows so the UPDATE query's take some time. Is there a more efficient way to update the data in the database than to use the df.iterrows() and run an...

what is the SQL prepared stament for lo_import in postgreSQL


c++,sql,database,postgresql,odbc
In postgreSQL we have option to import the file into database using lo_import method, which returns a OID using that we can export the file from database to the filesystem. eg: describe test table name text, file_id oid insert into test values('arul_test',lo_import('/home/arul/test.txt')); prepared statement would be insert into test values(?,?);...

In simple RESTful design, does PATCH imply mapping to CRUD's (ORM's) “update” and PUT to “destroy”+“create” (to replace a resource)?


database,rest,http,orm,crud
I'm trying to create a simple REST API and map it to CRUD. I have an ORM (DataMapper) which has methods like create, update and destroy. If I get it right, given a resource {a:'foo',b:'bar',c:'baz'}, performing a PUT {b:'qux'} is supposed to replace the resource and result in the same...

Desktop Database with Server without installation


java,database,server,desktop,h2
i have Java-Application that growth a lot over the past month. All configurations from the programm and all the logs are stored in .txt or .log files. The programm should change now. The user could install the programm on his own pc but the programm itself should get all the...

Database only adds (x) amount of rows before error system resources exceeded


database,vb.net,ms-access
I am having a problem with my code where i am only able to add so many lines of text before i get an error "system resources exceeded". This is my code: Dim x As Integer = MsgBox("Update Record?", MsgBoxStyle.YesNo, "Are you sure?") If x = MsgBoxResult.Yes Then Dim accessconn...

SQLite: Individual tables per user or one table for them all?


database,sqlite
I've already designed a website which uses an SQLite database. Instead of using one large table, I've designed it so that when a user signs up, a individual table is created for them. Each user will possibly use several hundreds of records. I done this because I thought it would...

C# Storing player cards Database Design


c#,mysql,sql,database,database-design
I'm having really hard time figuring out how to store cards each player owns in SQL database. My bets idea so far is to have one table with cards: [id], [cardName] And to associate it with players like that: [id], [playeName], [cardId], [quantity] This setup will allow me to easly...

ODBC ISAM_EOF without any reason


c#,database,odbc,cobol
I have a strange behavior with an ODBC Driver and the underlying COBOL database. The database driver is acuODBC of AcuCorp(now Microfocus), the database itself is a COBOL database. The DSN is a system DSN and works just fine. Via Access/Excel u can read/write data with the DSN successfully. In...

ElasticSearch asynchronous post


database,post,asynchronous,elasticsearch,get
I'm posting data on my ElasticSearch database. I've noticed that data is not immediately available, it requires some milliseconds to show up in a GET request. I can live with that (after all, the calls are asynchronous so this behavior is expected) but in my test code I need to...

Combining two select statements


sql,database,select,where
I have two statements as such: var chgAssociationQuery1 = (from a in sostenuto.PROBLEMS join b in sostenuto.S_ASSOCIATION on a.SERVICEREQNO equals b.FROMSERVICEREQNO join c in sostenuto.Changes on b.TOSERVICEREQNO equals c.SERVICEREQNO where b.FROMSERVICEID == 101001110 && b.TOSERVICEID == 101001109 && a.NAME.Contains(name) select new { ProblemReqNo = a.SERVICEREQNO, ProblemId = a.SERVICEREQID, ChangeReqNo =...

echo both users


php,mysql,sql,database,loops
The code at the bottom of this post currently echoes: Name: Spongebob Squarepants Description: I live in a pineapple under the sea. Role: editor But there are two users in "wp_usermeta". It's only echoing one. The result needs to look like this: Name: wp_dev_05 Description: My name is Chris Topher!...

How to use existing SQLite database in swift?


ios,database,xcode,sqlite,swift
I know there are some resources available for this but none of them clearly show the way how to do it properly. I have already populated .sqlite database (MTrader.db) and i want to connect it to my swift project and load the data from the database into spinner. I tried...

ER diagram for booking database


database,database-design
I'm creating a database for booking apartments app. I have a question - it is allowable to keep user's passwords in DB (for example using BCrytp)? Another question - where is the best way to keep price if it may vary during several months?

Does Maria DB support ANSI-89 join syntax


sql,database,join,syntax,mariadb
Does Maria DB support ansi-89 join syntax? SELECT sites.site_id, sites.site_name, pages.page_id, pages.page_title FROM sites, pages WHERE sites.site_id = pages.site_id; or only ansi-92 syntax? SELECT sites.site_id, sites.site_name, pages.page_id, pages.page_title FROM sites INNER JOIN pages ON sites.site_id = pages.site_id; ...

Improving work with SQL DataTime


sql,sql-server,database,tsql
I have a business in my Date. I need change date below for each date before 25 of each month I want get 25 of month before and for each date after 25 of each month I want get 25 of the same month. Example : for 2015/06/24 (or 2015/06/06)...

If I export my database with phpmyadmin will it lock my tables or take my database down?


mysql,database,phpmyadmin
I want to create a backup of my database using the phpmyadmin export function. the database can't have any down time so I need to know if running a database export will take the database down? I've looked on-line but all I get is instructions on how to export. No...

Purging Database - Count purged/not-purged tables


mysql,sql,sql-server,database,stored-procedures
So I am working with a database where I will be purging various tables that contain rows that are older than 30days. I have fairly limited knowledge of SQL and wanted to know if there was a certain way to select the row that will be purged and the rows...

CakePHP Unable to insert to database (datetime format)


database,datetime,cakephp,insert
I was new to Cakephp and I actually following the tutorial of the Blog tutorial however I didn't follow their database and try my own. Currently my database: My Model: class FypCakephp extends AppModel { //Table Name public $useTable = 'Report'; public $primaryKey = 'report_id';} My Controller: public function add()...

Why does the date doesn't match with what I have inserted into the database?


sql,database,oracle
I tried to display the sqlcommand after I saved into the database. Everything seemed to work pretty fine, but when I opened my table from TOAD, the dates are wrong. Here is my sql command: INSERT INTO USERTASK (USERTASKKEY, USERID, TASKKEY, TASKDATE, CREATEDATE, CREATEUSERID) VALUES (USERTASKSEQUENCE.NEXTVAL, 'admin2', '1', TO_DATE('05-06-2015','yyyy/mm/dd HH24:MI:SS'),...

Database object with different data


sql,asp.net,asp.net-mvc,database,entity-framework-6
I'm making a web page in ASP.NET MVC which compares prices from different shops. I have a one-to-many with products and the shops, where the SHOP has one PRODUCT and a PRODUCT has many SHOPs, the problem is that the product is the same but the price is different. Example:...

select data according to Row in Sqlite


android,database,sqlite,android-sqlite
image i want to get the whole row i am using this code to get my desired data but its giving me null pointer exception at temp_address1 here is the code as in mentioned image i want to get the whole row matching phone number. how can i achive that...

Complex SQL with Multiple Joins


mysql,database,join
I have a database of politicians, political parties and candidacies for a post in the election. The database consists of the following tables: People, Groups, Candidacies and Posts. The Candidacies table is a join relationship between People and Groups. Each record in the Candidacies table represents a candidacy in the...

SimpleMembershipProvider WebSecurity.InitializeDatabaseConnection The login from an untrusted domain


asp.net,database,exception,model-view-controller
I export the database to the server and i've problem. When I start application i see this error An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user code Login failed. The login is from an untrusted domain and cannot be used with Windows authentication. WebSecurity.InitializeDatabaseConnection("DefaultConnection",...

Displaying MySQL results in a single table


php,mysql,database
I created an interface in which the user can choose which results are going to be displayed. The options selected by the user are saved in an array, so the MySQL query goes through the different elements of this array. So I want to display the results in a single...

Order by count not sorting the records correctly?


php,mysql,database
I am using MySQL. I have two table i have attached the images of the both tables? When i apply ORDER by Count then the query retrieving result's from database but not sorting them correctly, i don't know what wrong i am doing? i searched some similar question in stack...

How I could create a db with the messages that are saved in admin/reports/dblog?


database,drupal,watchdog
I want to create a table in the db with the column message and with values from column message on admin/reports/dblog...Could someone help me? Or take the message from the db but in db the messages are with separated variables :/

Difference between dba_SEGMENTS and dba_data_files


mysql,sql,database,oracle11g,oracle-sqldeveloper
Shouldn't these two queries give the same result? First is a sum of all segments while other is the sum of all data files. They are giving different results for me. While the first one gives me 149522MB, the other gives 214973.34 MB select sum(bytes)/1024/1024 MB from dba_segments; select sum(bytes)/1024/1024...

MySQL: Select several rows based on several keys on a given column


mysql,sql,database
I have this mysql table structure: ------------------------------------ | item_id | meta_key | meta_value | ------------------------------------ 159 category Bungalow 159 location Lagos 159 price 45000 160 category Bungalow 160 location Abuja 160 price 53500 ... 350 category Bungalow 350 location Lagos 350 price 32000 What I'd like to do is select...

Foreign key in C#


c#,sql,sql-server,database
I have two tables, A and B, in a dataset in SQL Server; I have created a connection to the dataset in a c# project in visual studio. How can I create a foreign key ( A is the parent) between my two tables ? I want to create the...

Cassandra data model to store embedded documents


mongodb,database-design,cassandra
In mongodb we can able to store embedded documents into a collection.Then, How do we store embedded documents into cassandra??? For this sample JSON representation??? UserProfile = { name: "user profile", Dave Jones: { email: {name: "email", value: "[email protected]", timestamp: 125555555}, userName: {name: "userName", value: "Dave", timestamp: 125555555} }, Paul...

How to get node.js to connect to mongolab using mongoose


database,node.js,mongodb,mongoose,mongolab
I've been trying to use mongoose (module for node.js and mongodb). And tried to get a connection with mongolab up and running. I tried the following at the top of my app.js file, but I couldn't seem to enter the db.on function. global.mongoose = require('mongoose'); var uri = 'mongodb://username:password#####@ds.mongolab.com:#####/db'; global.db...

PreparedStatement.executeUpdate() doesn't insert in sqlite database


java,database,sqlite
i'm trying to make a DAO class for my Java project. I've a SQLite Database with only one table "USER". The schema is: CREATE TABLE USER( username VARCHAR(20) NOT NULL PRIMARY KEY, password VARCHAR NOT NULL, total_matches INTEGER DEFAULT 0, victories INTEGER DEFAULT 0, times_alien INTEGER DEFAULT 0, times_human INTEGER...

Messaging table performance - Merge from and to id`s into one single field vs separate 2 fields


mysql,performance,database-design,relational-database,database-schema
What would be the implications on performance on merging the users id from the "messages" table in form of "fromto" - ex userID - 5, userID 9 => "59" versus having two separate columns "from" and "to"? Flow - list, read, delete messages when both id`s will be available in...